Blood Microbiota Signature of Alzheimer's Disease (MICMALZ)

This is an interventional diagnostic trial for Alzheimer Disease focused on measuring Alzheimer, Memory, Aging, Microbiota Read More

Inclusion Criteria:

General criteria:

• Male and/or female;
• Age between 50-85 years;
• Having given their free, informed, written consent, signed by the participant and the investigator (at the latest on the day of inclusion and before any examination required by the research);
• Patient benefiting from a social security scheme

AD group:

• Diagnosis of Alzheimer's disease according to the international ATN criteria of Albert et al, (1) who had a diagnostic lumbar puncture and CSF biomarker assay and brain imaging with analysis of hippocampal atrophy; topographic and pathophysiological markers must be positive to confirm the etiopathogenic diagnosis;
• Mild to moderate stage with MMSE score between 10 and 26 ;
• Symptomatic treatments specific to Alzheimer's disease (acetylcholinesterase inhibitors and memantine) and psychotropic treatments (anxiolytics, antidepressants, neuroleptics) are authorized but must be at fixed doses for more than 3 months ;

Control group:

- Patients seen in memory consultation for concern of having AD but for whom the workup is normal. These patients will have had a diagnostic lumbar puncture during the same memory consultation.

Exclusion Criteria:

Inclusion criteria:

General criteria:

• Male and/or female;
• Age between 50-85 years;
• Having given their free, informed, written consent, signed by the participant and the investigator (at the latest on the day of inclusion and before any examination required by the research);
• Patient benefiting from a social security scheme

AD group:

• Diagnosis of Alzheimer's disease according to the international ATN criteria of Albert et al, (1) who had a diagnostic lumbar puncture and CSF biomarker assay and brain imaging with analysis of hippocampal atrophy; topographic and pathophysiological markers must be positive to confirm the etiopathogenic diagnosis;
• Mild to moderate stage with MMSE score between 10 and 26 ;
• Symptomatic treatments specific to Alzheimer's disease (acetylcholinesterase inhibitors and memantine) and psychotropic treatments (anxiolytics, antidepressants, neuroleptics) are authorized but must be at fixed doses for more than 3 months ;

Control group:

- Patients seen in memory consultation for concern of having AD but for whom the workup is normal. These patients will have had a diagnostic lumbar puncture during the same memory consultation.

Exclusion criteria:

General criteria:

• Absence of a family caregiver to complete the neuropsychological scales and questionnaires ;
• Patient living in a medical institution;
• Illiteracy or inability to complete the psycho-behavioral tests;
• Major physical or neurosensory problems likely to interfere with the tests;
• Contra-indication or refusal to perform the biological tests;
• Refusal to carry out neuropsychological tests.
• Refusal of stool collection
• Digestive neoplasia in progress or < 5 years old
• Digestive surgery with intestinal resection ;
• Presence of inflammatory bowel disease or other familial gastrointestinal pathology ;
• Chronic use of laxatives;
• Antibiotics taken within one month prior to inclusion;
• Short-term life-threatening conditions (active cancer, unstable heart failure, severe liver, kidney and respiratory failure);
• Chronic psychosis or psychotic episodes;
• Alcohol or drug addiction;
• Epilepsy and other non-degenerative diseases of the central nervous system
• Vitamin B12 deficiency and unsupplemented folic acid ;
• Untreated hypothyroidism;
• Patient deprived of liberty, by judicial or administrative decision;
• Major protected by law;
• Patient in a period of relative exclusion from another protocol;
• Refusal to participate in the protocol.

AD group :

• Insufficient clinical and paraclinical information for the diagnosis of AD;
• Genetic form of AD (known genetic mutation);

Control group: No specific non-inclusion criteria